The stove fire effects controller (shown below the picture) has two flickering outputs, the flickering fire effects from each of the outputs are different.The fire/stove effects unit can therefore be used with two fires/stoves. Or you could use both outputs with a bulb on each, within one fire/stove.This would increase the flickering effect still futher.Or use the second output behind the fire to create atmosphere within the hearth.The controllers microprossor uses random timings to simulate the flicker effect.It uses 7 different brightness levels, and 7 different lenghts of the brightness level.The result is a fire that really does appear real.Each output can power one standard dolls house bulb. (50ma)Controller size 32mm x 22mm.